2.va1-gedi-00htf-m-m5-phl-0001_1

DOCUMENT SUBMISSION STATUS: FC

1 Feb.17,2012 For Construction

0 Jul.21,2011 For Construction

REV. DATE DESCRIPTION DRAD CHKD APPN

OWNER

VIETNAM OIL AND GAS GROUP(PVN)

OWNERS CONSULTANT

POYRY ENERGY LTD EPC CONTRACTOR

VIETNAM MACHINERY INSTALLATION CORPPRATION(LILAMA)

EPC CONTRATORS CONSULTANT

PROJECT TITLE VUNG ANG 1 THERMAL POWER PLANT 2600MW

M-LOT 5-FLUE GAS DESULPHURIZATION PLANT

CONTRACT NO. 100510/LILAMA-GEDI&AEE

DOCUMENT TITLE FGD SYSTEM

SEAWATER SUPPLY SUBSYSTEM System Function Description of Seawater Supply and Absorber System

FUNCTION NAME SIGN DATE

DRWN Feb.17,2012CHKD Feb.17,2012

SUBCONTRACTOR

APPD

Feb.17,2012

DOCUMENT NO.: VA1-GEDI-00HTF-M-M5-PHL-0001

PAGES: 21

REV : 1

Vung Ang 1 Thermal Power Plant 2600 MW-M-Lot 5- SFGD Plant

- - iSYSTEM FUNCTION DESCRIPTION OF SEA WATER SUPPLY SYSTEM VA1-GEDI-00HTF-M-M5-PHL-0001

Table of Content

1. SCOPE........................................................................................................................................1

2. PROCESS DESCRIPTION......................................................................................................1

3. GENERAL DESCRIPTION OF OPERATION OF SWFGD ...............................................6

4. START-UP................................................................................................................................ 11

5. SHUT-DOWN ..........................................................................................................................15

6. AUTOMATIC START-UP AND SHUT-DOWN OF SPRAY PUMPS ................................18


- 1 - SYSTEM FUNCTION DESCRIPTION OF SEA WATER SUPPLY SYSTEM VA1-GEDI-00HTF-M-M5-PHL-0001

SYSTEM FUNCTION DESCRIPTION

OF SEAWATER SUPPLY AND ABSORBER SYSTEM

1. Scope

This document is based on the Piping and Instrumentation Diagrams (PIDs) and

provides the general system description for Seawater supply system and its auxiliaries

of SW-FGD for Vung Ang 1 coal fired power plant in Vietnam. Two (2) Flue Gas

Desulphurization (FGD) units are foreseen at this plant. The following specification

refers in parts to components of unit 1; however, it can be applied analogously for unit 2.

The seawater supply system includes the pump basin, the spray pumps, and the

absorber.

Reference documents:

Document Number Document Title

VA1-GEDI-01HTF-M-M5-PID-0001 PID Seawater supply unit 1

VA1-GEDI-01HTF-M-M5-PID-0002 PID Seawater spray pump A-D unit 1

VA1-GEDI-02HTF-M-M5-PID-0001 PID Seawater supply unit 2

VA1-GEDI-02HTF-M-M5-PID-0002 PID Seawater spray pump A-D unit 2

VA1-GEDI-01HTD-M-M5-PID-0001 PID Absorber unit 1

VA1-GEDI-02HTD-M-M5-PID-0001 PID Absorber unit 2

2. Process description

2.1 Pump station

A common pump basin is provided outside the spray pump house to lead seawater to

both unit aeration basins.

Four spray pumps per unit are provided in the spray pump house to elevate the

seawater from the pump basin to the absorption zone of the absorber. Each pump is

serving one absorber spraying level.

One pump is a stand-by unit and will be started only if one of the other pumps fails.

Two spray pumps shall be started in minimum before takeover of flue gas to avoid

problems in case of a failure of one spray pump.



Operation of spray pumps without Booster up Fan in operation shall be minimized to

max. 10 minutes in order to avoid salt incrustations on the GGH heating elements.

For start-up the spray pumps should be started one after the other to let equalize the

seawater level in the pump basin. Also, during shut-down one Spray pump after the

other should be stopped.

During automatic operation three Spray Pumps will be started. The operator can

pre-select the stand-by Spray Pump via a Pre-Selection Module within PLC.

In case of low boiler load operator can decide to operate the absorber with only one or

two Spray Pumps under consideration that the SO2 emission limit values are safety

ensured.

Each pump motor is equipped with an anti-condensation heating. The heating is

automatically switched OFF when the pump has started and automatically switched ON

when the pump has stopped.

Spray Pumps will be switched off via protection off signals, if the level in the pump basin,

or if the level in the absorber, or if the discharge pressure is too low, and/or other failure

signals from pump or motor are valid.

2.2 Absorber system

The SOx absorption takes place in a spray tower Absorber. The Absorber size is

dia.16m x 29.82m (total height) and the nominal level is 2.6m from the bottom.

In the top part of the absorber the water droplets are removed by the Mist Eliminator. A

two stage horizontal type mist eliminator will be provided.

For the mist eliminator in Absorber, a special flushing system is installed. The mist

eliminator is flushed with the common service water. Similar to the Service Water

system a minimum pressure limiter ensures a minimum flow back to the Service Water

Tank, if no flushing water is needed for the mist eliminator. Also, a pressure indicator,

10HTQ50 CP001, downstream of each pump group ensures a certain operation

pressure and starts the second pump as soon the pressure drops under a certain value.

Flushing ME needs to operate once a week or as the alarm difference pressure of mist

eliminator is active. Its an off-line system.



2.3 Process medium data

Medium in Pump Basin Seawater Remark

Design Density 1032 kg/m

Average solid content 0,01 g/l

Max. solid content 200 g/l

Max. chloride content 25 g/l

pH value 5,5-8,3

Temperature 7,5 40,4 C

2.4 Pump Basin Size

The pump basin size is 49m x 17m x 8.2m (length x width x height) and the nominal

level is 6m from the basin bottom.

2.5 Seawater Spray Pumps data

2.5.1 Table 1 Seawater Spray Pump A to D

No. Item Unit Pump data

1 Denomination Seawater Spray Pump

2 Number per Unit 4 ( 3 duty +1 assistant) *

3 KKS Code

10HTF11AP001 ; 20HTF11AP001

10HTF12AP001 ; 20HTF12AP001

10HTF13AP001 ; 20HTF13AP001

10HTF14AP001 ; 20HTF14AP001

4 Vendor Xiangfan 525 Pump Industry Co., Ltd.

5 Type Horizontal suction and vertical discharge

6 Type series LC 700 / 900 II

7 Location Indoors / in Pump House

8 Ambient C 20

9 Medium Temp. C 7.5 40.4




10 Flow rate m3/h 8000

11 Total head m

20.3 ; 20.1

22.1 ; 21.9

23.9 ; 23.7

25.7 ; 25.5

12 Impeller speed

(only for information) r/min

434 ; 432

449 ; 447

460 ; 458

472 ; 470

13 NPSHr m 6

14 Efficiency % 86%

15 Shaft power kW

531 ; 525

578 ; 572

625 ; 619

672 ; 667

16 Impeller diameter mm 900

17 Impeller slip velocity m/s 20.4 / 21.1 / 21.6 / 22.1

18 Sealing Mechanical

19 Bearing lubrication Grease

20 Driving Gearbox

Vendor Siemens Automation and Drives Group

(Flender)

Type H1SH09B

Cooling Fan & Cooling coil

21 Motor data

21.1 Vendor Xiangtan Motor Group Co., Ltd.

21.2 Type YKK500-4




21.3 Power kW 630 / 710 / 710 / 800

21.4 Pole 4

21.5 Protection IP54

21.6 Sync / full load speed r/min 1488

21.7 V /Ph /Hz 10KV / 3 / 50HZ

21.8 Cooling IC616

22 Material specification

22.1 Casing and cover ASTM A890-5A / 2507

22.2 Impeller ASTM A890-5A / 2507

22.3 Shaft ASTM A890-5A / 2507

22.4 Shaft sleeve ASTM A890-4A / 2205

22.5 Mechanical seal SiC

22.6 Bolts for installation 316L or CS hot dipped galvanized

22.7 Anchor Bolts 316L or CS hot dipped galvanized

22.8 Base steel structure CS with anti-corrosion painting

23 Noise (sound pressure level) 85 dB(A) at 1 meter off the proof hood

24 Outlines L x W x H 6500x2000x2570

25 Maintenance

Maximum lift weight ton 5

Maximum height m 5 from the base plate

Note: *) 1 of 4 pumps is stand-by to be selected by operators. The spray pump B was

recommended for the stand-by one. The stand-by pump should be operated at least 8h

per week.



3. General description of Operation of SWFGD

(Common description for all systems)

3.1 General Rules for Start-Up and Shut-Down

The term "Start-Up" shall mean to place a system that is "Ready for Operation" into the

trouble-free "On-Line" mode.

The operation personnel must check and confirm that the following conditions have

been met before each system is placed "On-Line":

All rules and regulations concerning accident prevention have been observed. All safety instructions concerning the handling of chemicals have been observed. The commissioning or the regular shut-down of the system has been properly completed and the system is "Ready for Operation".

All start-up requirements of the system have been met and all notes and remarks applicable to the system have been observed.

All ducts, basins and pipes have been checked and are "Ready for Operation". All manholes and inspection holes are closed. The system is clean and completely tight. The electrical systems are "On-Line" All machines are "Ready for Operation". All valves are "Ready for Operation". All instruments are "Ready for Operation". All local control panels are "Ready for Operation". The control system, PLC is "On-Line". All automatically controlled permissive and trips have been activated. All control loops are "Ready for Operation". All automatic control units are "Ready for Operation". All automatic sequencers that are used during start-up are "Ready for Operation" and in the modes stated in the document.

All maintenance requirements have been met.



3.2 Start-Up

In general the start-up procedure of SWFGD has to be done in a certain sequence

manually. General Preconditions for the start up of the FGD are: - Boiler is in constant load

- FGD in Bypass operation

- Soot free flue gas

- Acceptable flue gas temperature

- Acceptable ESP operation

- Stable Seawater from condenser conditions and flow to aeration basin

- All valves in position as listed in the valve list. Especially as follows:

i) Absorber Vent Valve in OPEN position

FGD Start up steps

1) Consumables Systems have to be available - Instrument Air System available

- Service Air System available (for GGH each Unit)

- CCCW System available (for BUF & Spray Pumps each Unit)

- Service Water System available

- Steam System available (for GGH each Unit)

- Electric Power connection of each system available.

2) SWFGD PLC and Measurement systems have to be in action - SWFGD Measurements available

- SWFGD Liquid Analyzer System in operation (for pH and DO)

- SWFGD PLC system in operation

3) Common Systems have to be available - Drain Pit Pump (Automatic Start/Stop control via SWFGD PLC activated)

- Service Water Pump available

- Service Water Tank (Automatic Start/Stop control via SWFGD PLC activated)

4) Aeration Basin System has to be in operation - Oxidation Air Blower system (4 of 5) in operation

5) GGH System - GGH Standstill Conservation has to be out of service

- GGH Seal Air System has to be started

- GGH Section Drive Unit (Automatic Start/Stop control via SWFGD PLC activated)



- GGH Blowing with Steam has to be set in automatic operation

- GGH Cleaning with HPW available (only be started by operator on local panel)

6) Spray Pumps and Absorber System has to be in operation - Absorber Mist flushing available

- Spray Pump System (3 of 4) in operation

7) Flue Gas Ducting System - Damper Seal Air System has to be in operation

- BUF Auxiliary Equipment has to be in operation

- GGH RDU has to be started

- Clean Gas damper has to be open

- Absorber Vent Valve has to be closed

- Raw Gas damper has to be open

- BUF with main motor has to be in operation

- Pressure Control BUF has to be set in automatic operation

- Bypass damper can be closed

3.3 A short shut down A short shut down procedure of the FGD plant consists of the following steps, which are

the same as the start up procedure but in reverse sequence:

1) Flue Gas Ducting System

- Bypass damper has to be open

- Damper Seal Air System remain in operation

- Pressure Control BUF has to be set to manual

- BUF has to be out of operation (main motor stopped)

- BUF Auxiliary Equipment remain in operation (decided by operator)

- Raw Gas Damper has to be closed

- Absorber Vent Valve has to be open

- Clean Gas Damper has to be closed

2) Spray Pumps and Absorber System remain in operation

- Absorber Mist flushing remain available

- Spray Pumps remain in operation

3) GGH System - GGH Rotor with Seal Air System remain in operation (decided by operator)

- GGH Section Drive Unit (Automatic Start/Stop control via SWFGD PLC remain in



operation)

- GGH Blowing with Steam has to be set to manual

- GGH Cleaning with HPW remain available (only be started by operator on local

panel)

- GGH Standstill Conservation out of operation

4) Aeration Basin System remain in operation

- Oxidation Air Blowers remain in operation

5) Common Systems

- Drain Pit Pump (Automatic Start/Stop control via SWFGD PLC remain in

operation)

- Service Water Pump remain available

- Service Water Tank (Automatic Start/Stop control via SWFGD PLC remain in

operation)

6) SWFGD PLC and Measurement systems

- SWFGD Liquid Analyzer System remain in operation (for pH and DO)

During a short shut down of the SWFGD, shut down step 1 can be stopped and the rest

of the FGD system will be kept in service. The spray pumps should not be in operation

during long Flue Gas Duct Bypass operation periods, as the sea water mist from the

absorber can raise in reverse direction back into the GGH.

3.4 The planned shut down The planned shutdown procedure of the FGD plant consists of the following steps,

which are the same as the start up procedure but in reverse sequence:

1) Flue Gas Ducting System

- Bypass damper has to be open

- Damper Seal Air System remain in operation

- Pressure Control BUF has to be set to manual

- BUF has to be out of operation (main motor stopped)

- BUF Auxiliary Equipment remain in operation (decided by operator)

- Raw Gas Damper has to be closed

- Absorber Vent Valve has to be opened

- Clean Gas Damper has to be closed

2) Spray Pumps and Absorber System can be stopped

- Absorber Mist flushing has to be out of operation



- Spray Pumps can be stopped

3) GGH System - GGH Rotor with Seal Air System remain in operation (decided by operator)

- GGH Section Drive Unit (Automatic Start/Stop control via SWFGD PLC remain in

operation)

- GGH Blowing with Steam has to be set to manual

- GGH Cleaning with HPW remains out of operation (only manually!!)

- GGH Standstill Conservation can be started by operator (only manually!!)

4) Aeration Basin System

- Oxidation Air Blowers can be stopped (at least 15 min after Spray Pumps stopped)

5) Common Systems

- Drain Pit Pump (Automatic Start/Stop control via SWFGD PLC remain in

operation)

- Service Water Pump remain available

- Service Water Tank (Automatic Start/Stop control via SWFGD PLC remain in

operation)

6) SWFGD PLC and Measurement systems

- SWFGD Liquid Analyzer System remain in operation (for pH and DO)

In order to avoid low temperature corrosion, sealing fans for Damper and GGH with

electric heater have to run at least 24 hours later, even if GGH rinsed by the

low-pressure water. If the flue gas ducting has not been dried completely, extending the

drying time is recommended.

3.5 SWFGD emergency shut-down In order to avoid damages to the SWFGD plant, an emergency shut down (ESD)

conditions shall be implemented. The ESD conditions protect the plant from being

endangered by offset operating conditions. It shall be fully automated and designed to

handle all critical events, which might occur in the plant.

The ESD conditions as following will result in Bypass Damper Fast Speed Open:

- SWFGD electricity lost, the SWFGD system protection stop

- The Booster Up Fan ( 10HTC10AN001) is in trip

- Instrument air pressure (10HTX01CP001) lower than 0.4MPa

- In normal running, raw gas damper (10HTA05AA201) closed or clean gas

damper (10HTA20AA201) closed



4. Start-Up

4.1 Preconditions for Start-Up

System is "Ready for Operation" after the general start-up conditions have been

fulfilled.

Furthermore the following conditions should be checked before each start-up:

All consumable systems are On-Line SWFGD PLC and instrumentations are in service Drain Pit Pump sequence and Service Water Pump sequence are in service Oxidation Air Blowers sequence is in service All valves in position as listed in the valve list All basin are filled-up with seawater Flue Gas Ducting sequence is ready to be started as soon as Spray Pumps are in operation

4.2 Manual Procedure

The manual start-up of the system shall be done in the same way as per automatic

procedure, according to function logic diagram.

4.3 Automatic Procedure

4.3.1 Release Conditions

4.3.1.1 Spray Pump A (10HTF11AP001)

The start-up sequence of the Sub Function Group Module Spray Pump A can be started

only, if the following release conditions are fulfilled:

No. Logic KKS Designation Condition

1 1 o o 2 10HTQ01CL901 L 1 out of 2 Pump Basin L > LL

AND

2 00HTQ90CT001 P CCCW Supply P > L



The release conditions for Spray Pump B (10HTF12AP001), Spray Pump C

(10HTF13AP001) and Spray Pump D (10HTF14AP001) are analogous.

4.3.1.2 Sub-Function Group ME 1A Flushing (10HTQ50 EC001)

It is a discontinuous operation. The start-up sequence of the Sub Function Group

Module ME Flushing (abbr. Mist Eliminator) can be started only, if the following release

conditions are fulfilled:


1 10HTC10AN001 BUF ON

AND

2 1 o o 2 PSM

Service Water Pump ON

00HTQ21AP001 Service Water Pump A ON

00HTQ21AP002 Service Water Pump B ON

AND

3 NOT 10HTA05CT901 T Raw Gas Inlet T < L

AND

4 NOT 10HTQ50CP001 P Service Water Before ME P < L

AND

5 Once a week



4.3.2 Start-up sequence


The start-up sequences for Spray Pump B (10HTF12AP001), Spray Pump C


Status: Spray Pump A, 10HTF11AP001 is "Ready for Operation"

No. Action/Adjustment KKS Designation Check Box

1 OPEN 10HTF11AA201Shut Off Valve Suction Side

Spray Pump A OPEN

2 ON 10HTF11AN001

10HTF11AN002

Motor Cooling Air Fan A1

Motor Cooling Air Fan A2 OPEN

3 ON 10HTF11AP001 Spray Pump A ON

AND

P > MIN(LL) 10HTF11CP001 P Spray Pump A P > LL

AND Start Time Delay 60 sec

Status: Spray Pump A, 10HTF11AP001 is "On-Line"

Remarks: The Standstill Heating Spray Pump A (10HTF11AH001) will be switched ON

and OFF automatically via switchgears (switched ON if pump is OFF, switched OFF if

pump is ON).

4.3.2.2 Sub-function Group - ME 1A Flushing

The mist eliminator has three stages flushing nozzles, 1A, 1B and 2A. Each stage

flushing has six flaps, which 1A flaps are motorized and others are manul.

Status: Service Water Flap ME INL, 10HTQ50AA201

Flushing Flap ME 1A-1, 10HTQ51AA201;

Flushing Flap ME 1A-2, 10HTQ51AA202







all flaps are "Ready for Operation"


1 CLOSE 10HTQ50AA201 Service Water Flap ME INL CLOSED

2 OPEN 10HTQ51AA201 Flushing Flap ME 1A-1 OPENED

3 OPEN 10HTQ50AA201 Service Water Flap ME INL OPENED

4 AND Time Delay 60sec


6 CLOSE 10HTQ51AA201 Flushing Flap ME 1A-1 CLOSED

7 AND Time Delay 60 sec













20 CLOSE 10HTQ50AA201 Service Water Flap ME INL CLOSED


Status: SFG - ME 1A Flushing is "END".



5. Shut-down

5.1 Preconditions for Shut-down of an individual Spray Pump The following conditions should be checked before each shut-down of an individual

Spray Pump:

The SWFGD SO2 removal efficiency will significantly decrease as soon as one Spray Pump will be stopped. Therefore shut-down of Spray Pumps is allowed only in

case of extremely low SO2 load in the raw flue gas.

5.2 Preconditions for Shut-down of all Spray Pumps

The following conditions should be checked before shut-down of all Spray Pumps:

FGD Flue Gas Ducting shall be in bypass mode (Bypass Damper opens, Raw Gas Damper and Clean Gas Damper closed).

5.3 Manual Procedure

The manual shut-down of the system shall be done in the same way as per automatic

procedure, according to function logic diagram.

5.4 Automatic Procedure

5.4.1 Protection Off


The following protection off conditions result in an automatic shut-off of Spray Pump A

(10HTF11AP001).


1 10HTF11AA201 Shut Off Valve Suction Side Spray

Pump A NOT OPEN

OR

2 10HTF11AP001 Spray Pump A ON

AND Start Time Delay 10 sec




AND 10HTF11CP001 P Spray Pump A P < LL

OR

3 1 o o 2 10HTQ01CL901 L 1 out of 2 Pump Basin L < LLLL

OR

4 2 o o 3 10HTD01CL901 L 2 out of 3 Absorber L > HH

OR

5 10HTF11CT601 T Motor Winding 1 Spray Pump A T > HH

OR


OR


OR


OR


OR


OR

11 10HTF11CT607 T Motor Bearing Drive End Spray

Pump A T > HH

OR

12 10HTF11CT608 T Motor Bearing Non Drive End

Spray Pump A T > HH

OR

13 10HTF11CT609 T Pump Bearing Drive End Spray

Pump A T > HH

OR

14 10HTF11CT610 T Pump Bearing Non Drive End T > HH




Spray Pump A

OR

15 10HTF11CT611 T Pump Body Oil Spray Pump A T > HH

OR

16 10HTF11CT612 T Gear Box Oil Spray Pump A T > HH

OR [!!!Only for Pump B/ C/ D]

17 10HTF12/13/14

CP101 P Spray Pump X p < l

The shut-off conditions for Spray Pump B (10HTF12AP001), Spray Pump C


5.4.2 Shut-down sequence


The shut-down sequence can be applied correspondingly for Spray Pump B

(10HTF12AP001), Spray Pump C (10HTF13AP001), and Spray Pump D

(10HTF14AP001).

Status: Spray Pump A, 10HTF11AP001 is "On-Line"


1 STOP 10HTF11AP001 Spray Pump A OFF

2 WAITING STEP balancing time 60 sec

3 CLOSE 10HTF11AA201Shut Off Valve Suction Side

Spray Pump A CLOSED

4 WAITING STEP 60 sec

5 STOP 10HTF11AN001

10HTF11AN002

Motor Cooling Air Fan A1

Motor Cooling Air Fan A2 OFF

Status: Spray Pump A, 10HTF11AP001 is "Off-Line"



6. Automatic Start-up and Shut-down of Spray Pumps

6.1 Pre-Selection for Automatic Start-up

During automatic operation three Spray Pumps are in continuous operation. One Spray

Pump will be a stand-by unit.

Via Pre-Selection Module Spray Pumps 10HTF10EE001 the operator can pre-select

the pump which shall be in stand-by:

Pre-selection 1: Spray Pump A

Pre-selection 2: Spray Pump B

Pre-selection 3: Spray Pump C

Pre-selection 4: Spray Pump D

If Spray Pump B is pre-selected (preferred) the start-up sequence for automatic spray

pump start-up is:

- Sub-Function Group for Spray Pump D, 10HTF14EC001 (as first pump)

- Sub-Function Group for Spray Pump C, 10HTF13EC001 (as second pump)

- Sub-Function Group for Spray Pump A, 10HTF11EC001 (as third pump)

Sub-Function Group for Spray Pump B (10HTF12EC001) will be the stand-by unit in

this case. This Sub-Function Group will be started automatically if one of the other

pumps fails.

Note: The operator shall take care that during one year of operation the running times of

all four pumps are nearly the same; nevertheless Spray Pump B is the preferred

stand-by pump.

6.2 Automatic Start-up

The automatic start-up of Sub-Function Group Spray Pump A (10HTF11AP001),

Sub-Function Group Spray Pump B (10HTF12AP001), Sub-Function Group Spray

Pump C (10HTF13AP001) and Sub-Function Group Spray Pump D (10HTF14AP001)

will be done via Function Group Spray Pumps (10HTF10EC001) and done

pre-selection.



6.2.1 Release Conditions

The start-up sequence of the Function Group Spray Pumps can be started only if the

following release conditions are fulfilled:


1 1 o o 2 10HTQ01CL901 L 1 out of 2 Pump Basin L > L

6.2.2 Start-up sequence

The following start-up sequence for Pre-selection 2 (Spray Pump B is standby) can be

applied correspondingly for the other pre-selections, too.

Status: Spray Pump A (10HTF11AP001), Spray Pump B (10HTF12AP001),

Spray Pump C (10HTF13AP001) and Spray Pump D (10HTF14AP001)

are "Ready for Operation"


1 START 10HTF14EC001 Sub-FG Spray Pump D ON

IF SUB-FG IS ON

OR

IF PUMP FAILS

2 START 10HTF13EC001 Sub-FG Spray Pump C ON

IF SUB-FG IS ON

OR

IF PUMP FAILS

3 START 10HTF11EC001 Sub-FG Spray Pump A ON

IF PUMP FAILS

4

START

STAND-BY

SUB-FG

10HTF12EC001 Sub-FG Spray Pump B ON



Status: Spray Pump C, Spray Pump D and Spray Pump A are "On-Line".

Or:

One of the three pre-selected Spray Pumps fails and Spray Pump B is

"On-Line" too.

6.3 Automatic Shut-down

The automatic shut-down of Sub-Function Group Spray Pump A (10HTF11AP001),

Sub-Function Group Spray Pump B (10HTF12AP001), Sub-Function Group Spray

Pump C (10HTF13AP001), and Sub-Function Group Spray Pump D (10HTF14AP001)

will be done via Function Group Spray Pumps (10HTF10EC001).

Status: Spray Pump A (10HTF11AP001), Spray Pump C (10HTF13AP001), and

Spray Pump D (10HTF14AP001) are "On-Line".

Spray Pump B (10HTF12AP001) is Stand-by


1 STOP 10HTF11EC001 Sub-FG Spray Pump A OFF

IF SUB-FG IS

OFF

2 STOP 10HTF12EC001 Sub-FG Spray Pump B OFF

IF SUB-FG IS

OFF

3 STOP 10HTF13EC001 Sub-FG Spray Pump C OFF

IF SUB-FG IS

OFF

4 STOP 10HTF14EC001 Sub-FG Spray Pump D OFF

Status: All Spray Pumps are "Off-Line"



6.4 Reduced SO2 Load

During automatic operation three Spray Pumps are in operation.

In case of low boiler load, i.e. in case of extremely low SO2 load in the raw flue gas, the

operator may decide to operate the absorber with only one or two Spray Pumps.

In this case operator has to set the Function Group Spray Pumps (10HTF10EC001) in

manual mode and has to stop a Sub-Function Group for one or two Spray Pumps.

As soon as clean gas SO2 concentration gets unacceptable high the operator must

restart one or two Spray Pumps by the related Sub-Function Group module.

2.va1-gedi-00htf-m-m5-phl-0001_1

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